Epiphany doesn't provide automation to perform Ubuntu release upgrade.
For information about upgrading Ubuntu release, please refer to Ubuntu documentation.
For testing purposes, we use Ansible playbook (ci/ansible/playbooks/os/ubuntu/upgrade-release.yml), however it is strongly recommended that an administrator is involved to prepare for and perform the upgrade.
Epiphany doesn't provide automation to perform Red Hat Enterprise Linux release upgrade.
For information about upgrading RHEL release, please refer to RHEL documentation.
For testing purposes, we use Ansible playbook (ci/ansible/playbooks/os/rhel/upgrade-release.yml), however it is strongly recommended that an administrator is involved to prepare for and perform the upgrade. This feature is still in experimental stage and is not fully operational yet.
Epiphany does not support upgrade of CentOS system since it's not supported in Epiphany 2.x at all. We switched to AlmaLinux 8 instead.